Concrete pile and method of forming same.



4 0. MoQ-OBMIGK. CONCRETE PILE AND METHOD OF FORMING APPLIOATION FILED AUG. 17, 1911 withaooeo CHARLES MCCDRMICK, OF ST.

LOUIS, MISSOURI.

CONCRETE PILE AND METHOD OF FORMING SAME.

Specification of Letters Patent.

Patented Feb. 1 1,1 913.

Application filed August 17. 1911. Serial No. 644,589.

To (lilac/ 10m it may waver/z Be it known that I. Ciunnns McCounicK. a citizen of the United States. residing at the city of Louis. Htatc oi Missouri, have invented certain new and u etnl Improve ments in Concrete Tiles and l\lethods-o'l Forming Same. of which the toltowing is a specification.

This invention relates to certain new and useful improvemems in concrete piles and method of forming same. and the object ot the invention is to provide an improved concrete pile which may be asily and tpiicldy driven into tin earth. and turther to provide a snnplitied method ot f rming a conercte screw-t'ln'eadcd pile in the grt'iund.

In the drawings: l igure l, a side elevation of a screw-threadcil concrete pile, the head thereof being shown in section, Fig. 2 is a side elevation partly broken away and shown in section of the device employed for carrying out the method, Fig. 3 is a sectional view of a pile in the course of coin struction, Fig. 4 a top plan view of lfiig. l Fig. 5 a top plan view of modified form of head for the concrete pile. Fig. (3 is a similar View of another modilied torin o1 head for the concrete pile, Fig. 7 is a tragmentary sectional view of a still further modified form of head for the concrete pile, Fig. 8 is a top plan view o'l another modified form of head for the concrete pile, Fig. 9 is a fragmentary side elevation oi l ig. 8, .and Fig. 10 is a top plan view ot? a still further modified form of head for the concrete pile.

In carrying the invention into practice. a concrete pile 1 is torn'ied with an anger end 2, and with a spiral groove 8, which extends substantially the length of the pite the groove acting as a passage to receive the dirt which is freed by the auger 2. when the latter is driven into the ground. "the pile is formed with an enlarged head t which is molded integral therewith. and is surrounded by a metal cap 5, the latter being secured rigidly to the head 4, by any suitable means such for instance as the inwardly extending projections (i. which extend into the head t. In order to drive the piles into the ground, the heads thereof are formed with. suitable means to engage with an engine or other driving connection.

In Figs. 1 and t; the metal cap 5 has its top formed with a diametrically extending slot- 7, which registers with a similar slot 8 formed in the head of pile 1, in which slots the blade of a driving connection like that of a screw driver, enters.

In Fig. 0, the top oi cap 5, and the head of tho pilc are formed with crnci-torm registering slots 9. for the reception of a driving connection. which latter has a cruei-tor'm projection to enter the slots.

in Fig. i the cap I) and the head 4- ol the pile ul'c tormed with opening it) and depression 11. respectively, the two registering and combining to form an outwardly flaring socket into which a projection of similar l'ornl ot' the driving means extends.

in l-igs. S and t), the metal cap 5 is provided with an upwardly extending projection 12, ot angular cross ,ct-ion, which tits in a soehet of similar cross-section carried by the driving means.

In lfiig. 10, the metal cap 5 is termed with rigid and preferably integral diai'netrically opposed ribs 13, which extend along the sides of cap 5. In this :tlorm of the invention, the driving means is formed to engage with the ribs 13. in orde'rto etiect rotation of the pile.

The metal cap 5, assists in strengthening the pile especially at the head therebf where the greatest stress in driving the pile occurs. The driving of the pile into the ground may be accomplished. either by rotation by means oi an engine in the Same manner as a screw driver drives a screw into wood. or it may be accomplished by straight, line pressure by means of compressed air or the like. In some cases, it. may be found desirable or necessary to form the concrete pile in the ground, and in such cases, a longitudinally bored or hollow shell 14: is employed which is provided with an external spiral groove 15, the lower end of the bore being reduced and threaded, as indicated by the numeral 16 to receive a. removable gimlet point 17. The shaiilc 18 of the gimlet point is threaded and engaged in the threaded portion 1t, oi the shell bore, and the upper end of said shank bears a head it) formed with diametrically opposed peripheral notches 20, for engagement with any suitable means to rotate the gimlet point so as to permit same to be disengaged from the shell, and then withdrawn through the bore thereof by means of a rod having a hook which is caused to enter an eye 22 secured to the head 19 or any other suitable withdrawing means may be employed. The upper end of shell 14 is provided with a head 23, formed with diametrically opposed peripheral notches 9A for engagement with a fills and naturally shapes itself into the sumo the exact configuration thereof.

threaded concrete piles in the ground consisting of an externally-threacled substantially cylindrical shell adapted to be screwed into the ground which opens through the opposite ends thereof; and av borin point removably fitted in the lower end of said bore and having means for withdrawing it upwardly through the latter.

4. A device for. threaded concrete piles in the ground con sisting of an externally-threadedsubstantially cylindrical shell adapted to be screwed into the a bore which opens throngh the opposi ends thereof; and a boring point removal) fitted in the lower end 'lriving connection or the like, the shell bore opening through said head, as shown in F ig. 2.

In forn'iing a pile in the ground, the shell 14 is screwed into the ground, the giinlet point occupying the position depicted in Fig. 2. After the shell has been driven into the ground to the proper depth, the gimlet point is removed as above described, thus leaving the lower end of the shell open. Plastic concrete under pressure is then introduced into the shell bore and the shell is rotated so as to cause same tobe withdrawn from the ground, and the concrete being under pressure exudes from the lower open end of the shell and compactly form of the hole made by the screw-like shell, as depicted in Fig. 3 of the drawings. Thus a concrete mass of screw -threaded exterior form is left in the ground, which, when itsolidifies, provides a concrete pile of the same form as that depicted in Fig. 1 of the drawings.

Great advantage is obtained by the use of a screw-threaded pile, as it is' held more firmly in place than is possible in the case of a smooth-sided pile.

While the drawings show the screwthreads countersunk, yet it is within the purviewof this invention and the claims herein that said screw-threads may be of said bore ar having means for withdrawing it upwardi through the latter, said shell being formed at its upper end with a driving head.

5. A device for threaded concrete piles in the ground com sisti'ng of an externally-threaded substaninto the ground andprovided with a here which opens through the opposite ends thereof, the lower end of said here being reduced and threaded; and a boring point having a threaded shank removably fitted in said lower bore end and adapted to be here, said shank being provided with witliforming externally groundand provided with;

forming externally tially cylindrical shell adapted to be screwed and provided with. a bore 1 I withdrawn through the upper end of said formed by the provision of projecting spiral drawing means.

blades. 6. A device for forming externally 'What is claimed i threaded concrete piles in the ground con 1. The method of f i t ll sisting of an externally-threaded substan thrcaded concrete piles in the ground which consists in screwing into the ground an externally threaded hollow shell having a removable boring point at its lower end withdrawing said point through the bore of said shell at the conclusion of the boring operation, to leave said shell end open: rotating said shell to withdraw the same from the hole made thereby,- and forcing plastic concrete under pressure through said shell horeand its open lower end into said hole simultaneously with the withdrawal of said shell, to cause the concrete to fill said hole and assume the exact configuration thereof. 2.' The method of forming externallythreaded concrete piles in the ground which consists inscrewing' into the ground an externally threaded. hollow shell: rotating said shell at the conclusion of the boring operation, to willulraw the same from the hole made thereby during such operation; and l'ori' ng plastic concrete through the bore of said shell into said hole simultaneously with the withdrawal of said shell, to cause the concrete to [ill said hole and assisting of an externally-threaded substantially cylindrical shell adapted to be screwed into the ground and provided with a bore which opens through the opposite ends thereof, the lower end of said bore being reduced and threaded; and a boring point having a threaded shank removably fitted in said lower bore end and adapted to be witlnlriuvn through the upper end of said bore, the inner end of said shank having a head provided with withdrawing means.

In testimony whereof lhereunto atlix my signature in the presence of two witnesses.

CHARLES MctOltMlCK. ll' itncsses Lo'r'ris M. For,

device for BERTHA Von Bantams.

forming e vternallv threaded concrete piles in the ground con- 

